Abstract

Measurements of scattering/extinction and asymmetry ratios at both polarization orientations, along with depolarization and reciprocity ratios, corresponding to nanosized Fe2O3 aggregates were carried out in an Fe(CO)5-seeded CO air-diffusion flame as a function of the position above the burner surface. The measurements were combined with an exact light-scattering theory to yield, for the first time, the complex refractive index, the primary particle-size parameter, the aspect ratio, and the number density and volume fractions of the Fe2O3 chainlike aggregates under flame conditions. An effective complex refractive index of 1.96 ± 6.9% to 0.20 ± 14.5% was inferred from the data analysis at a wavelength of 488 nm and in the temperature range of 894–924K. The corresponding primary particle size was found to be 48 nm ± 13%, and the aggregate aspect ratio was in the range of 6–7. Comparisons of the size parameters are made with transmission electron microscopy results, and the possible sources of uncertainties in the inferred results pertaining to temperature, polydispersity effects, and the departure from the straight configuration are discussed.

© 2003 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Effects of polydispersity of chainlike aggregates on light-scattering properties and data inversion

Tryfon T. Charalampopoulos and Guocai Shu
Appl. Opt. 41(4) 723-733 (2002)

Role of metal additives in light scattering from flame particulates

T. T. Charalampopoulos, D. W. Hahn, and H. Chang
Appl. Opt. 31(30) 6519-6528 (1992)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (4)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (53)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription